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CN-121986003-A - Cutting insert, cutting tool, and method for manufacturing cut product

CN121986003ACN 121986003 ACN121986003 ACN 121986003ACN-121986003-A

Abstract

The cutting insert according to an undefined aspect of the present disclosure has a main body portion and a cutting portion located on a side of a distal end of the main body portion. The cutting portion has an upper surface extending from the front end surface toward the main body portion. The upper surface has a pair of first chip breaking protrusions extending from the side of the main body portion toward the front end face, respectively, and a pair of second chip breaking protrusions extending from the first chip breaking protrusions toward the front end face, respectively. The pair of first chip breaking protrusions each have a front side surface located on the front end side and having a flat inclined area. The pair of second chip breaking protrusions are curved in shape and extend from the front side surfaces toward the front end surfaces of the pair of first chip breaking protrusions, respectively.

Inventors

  • Ikeda korehito

Assignees

  • 京瓷株式会社

Dates

Publication Date
20260505
Application Date
20241016
Priority Date
20231030

Claims (10)

  1. 1. A cutting insert having a stick shape extending along a central axis from a front end to a rear end, wherein, The cutting insert has: a main body part, and A cutting portion located closer to the distal end than the main body portion, The cutting portion has: a front end face located on the side of the front end; An upper surface extending from the front end surface toward the main body portion; a first side surface adjacent to the front end surface and the upper surface, and A front edge located at the intersection of the front face and the upper surface, The upper surface has: a pair of first chip breaking protrusions extending from one side of the main body toward the front end face, respectively, and A pair of second chip breaking protrusions extending from the first chip breaking protrusions toward the front end face, The pair of first chip breaking protrusions each have a front side surface located on the side of the front end and having a flat inclined area, The pair of second chip breaking protrusions are curved in shape and extend from the front side surfaces of the pair of first chip breaking protrusions toward the front end surface, respectively.
  2. 2. The cutting insert according to claim 1, wherein, The second chip breaking protrusion is connected with the front end blade.
  3. 3. The cutting insert according to claim 1 or 2, wherein, In a cross section orthogonal to the central axis, the inclined region is parallel to the leading edge.
  4. 4. The cutting insert according to any one of claims 1 to 3, wherein, The inclined region is located above the second chip breaking projection.
  5. 5. The cutting insert according to any one of claims 1 to 4, wherein, The width of the inclined region in the direction along the leading edge becomes narrower as it goes upward.
  6. 6. The cutting insert according to any one of claims 1 to 5, wherein, The upper surface further has an inclined surface which is located closer to the main body than the pair of first chip breaking protrusions and which faces upward as approaching the main body, The inclination angle of the inclined area is larger than the inclination angle of the inclined surface.
  7. 7. The cutting insert according to any one of claims 1 to 6, wherein, The upper surface further has a rake surface located between the pair of first chip breaking protrusions and the pair of second chip breaking protrusions, facing downward away from the leading edge, The lower end of the rake surface is located between the pair of first chip breaking protrusions.
  8. 8. The cutting insert according to any one of claims 1 to 7, wherein, The pair of first chip breaking protrusions extend in a direction in which the interval between them becomes narrower as approaching the leading end edge, The pair of second chip breaking protrusions extend in a direction in which a distance from each other becomes wider as approaching the leading end edge.
  9. 9. A cutting tool, wherein, The cutting tool has: A shank extending from a first end toward a second end and having a pocket on a side of the first end, and The cutting insert according to any one of claims 1 to 8, located within the pocket.
  10. 10. A method for manufacturing a machined product, wherein, The method for manufacturing the machined product comprises the following steps: a step of rotating the workpiece; The process of contacting the cutting tool according to claim 9 with the workpiece being rotated, and And a step of moving the cutting tool away from the workpiece.

Description

Cutting insert, cutting tool, and method for manufacturing cut product Cross-reference to related applications The present application claims priority from japanese patent application No. 2023-185156, filed 10/30 in 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field The present disclosure relates to a cutting insert, a cutting tool, and a method of manufacturing a cut product for cutting a workpiece. Examples of the cutting process include turning and milling. Examples of the turning include an inner diameter machining, an outer diameter machining, a grooving machining, and a cutting machining. Background As a cutting tool used for cutting a workpiece, for example, a cutting tool described in japanese patent application laid-open No. 9-174308 (patent document 1) is cited. The cutting tool described in patent document 1 is a tool for grooving operations, and includes a shank and a cutting insert (hereinafter, also simply referred to as "insert"). The insert disclosed in patent document 1 has a pair of chip breaking protrusions extending from a leading edge. In the cutting process, the chip is deformed by bringing the chip into contact with the pair of chip breaking protrusions, and the speed of the chip flow is controlled. However, in the case of having only a pair of chip breaking projections having a simple structure, there is a lack of versatility in terms of cutting conditions and the kind of material of the workpiece. For example, in cutting with a small feed amount or in cutting with a soft material such as aluminum, soft steel, or low carbon steel, it is difficult to control chip deformation, and the control of the chip flow rate by the chip breaking protrusions, that is, the effect of blocking chips (scattering), is limited. The present disclosure has been made in view of the above problems, and an object thereof is to provide an insert having excellent versatility with respect to cutting conditions and material types of a workpiece. Disclosure of Invention The cutting insert of an undefined aspect of the present disclosure is in the shape of a rod extending along a central axis from a front end to a rear end. The cutting insert has a body portion and a cutting portion located closer to the tip than the body portion. The cutting portion has a front end surface located on the side of the front end, an upper surface extending from the front end surface toward the main body portion, a first side surface adjacent to the front end surface and the upper surface, and a front end edge located at an intersection of the front end surface and the upper surface. The upper surface has a pair of first chip breaking protrusions extending from the side of the main body portion toward the front end surface, respectively, and a pair of second chip breaking protrusions extending from the first chip breaking protrusions toward the front end surface, respectively. The pair of first chip breaking protrusions each have a front side surface located on the side of the front end and having a flat inclined area. The pair of second chip breaking protrusions are curved in shape and extend from the front side surfaces of the pair of first chip breaking protrusions toward the front end surface, respectively. Drawings Fig. 1 is a perspective view of a cutting insert illustrating an undefined aspect of the present disclosure. Fig. 2 is an enlarged view of the region II shown in fig. 1. Fig. 3 is a top view of the upper surface of the cutting insert shown in fig. 1, as seen from the front. Fig. 4 is an enlarged view of the region IV shown in fig. 3. Fig. 5 is a side view of the cutting insert shown in fig. 3, viewed from the V direction. Fig. 6 is an enlarged view of the region VI shown in fig. 5. Fig. 7 is a top view of the cutting insert shown in fig. 3, viewed from VII. Fig. 8 is an enlarged view of the front end of the cutting insert shown in fig. 3. Fig. 9 is a cross-sectional view of the IX section of the cutting insert shown in fig. 8. Fig. 10 is a cross-sectional view of an X-section of the cutting insert shown in fig. 8. Fig. 11 is a cross-sectional view of the XI cross-section of the cutting insert shown in fig. 8. Fig. 12 is a cross-sectional view of the section XII of the cutting insert shown in fig. 8. Fig. 13 is a cross-sectional view of the XIII section of the cutting insert shown in fig. 8. Fig. 14 is a cross-sectional view of the XIV section of the cutting insert shown in fig. 8. Fig. 15 is an enlarged view of the front end of the cutting insert shown in fig. 3, and is a cross-sectional view parallel to the center axis and the front end edge. Fig. 16 is a perspective view of a cutting tool illustrating an undefined aspect of the present disclosure. Fig. 17 is a schematic view showing one process in a method for manufacturing a machined product according to an undefined aspect of the present disclosure. Fig. 18 is a schematic view showing one process in a method for manu